1 Beard St., Brooklyn, NY 11231

Red Hook

"vapor intrusion" VOCs brownfield CVOCs SSDS "Solar Energy"

imageOn a pier outside Ikea. Photo by Adam Eisenstat.
Site Description[1]
The U.S. Dredging site is a 48 acre former industrial property in a commercial and industrial area along Beard Street in the Red Hook area of Brooklyn. About 25 acres of the site are underwater in the Erie Basin. Until early 2005, a ship repair facility and a variety of small industrial and commercial operations occupied the nineteen on-site buildings. Since the 1860s shipyards and related ship maintenance and repair operations have occupied the site. Historically, shipyards have utilized a variety of hazardous materials, including petroleum products, solvents, PCBs, and heavy metals such as mercury, arsenic, lead, and copper. Most of the upland portion of the site was created by filling in the basin at different points in the site's history. The fill materials used at the site are unknown, but may have included coal and incinerator ash, demolition debris, and industrial wastes, which commonly were used as fill throughout the City in past decades. Site investigations found metals and PAHs contamination in most of the soil samples collected from throughout the site. Much of the contamination can be attributed to historic fill that was used to fill in this former water body / marshland. But, elevated concentrations of lead, mercury, copper and arsenic are due to site activities. Areas of VOC and PCB contamination were found in relatively limited areas. Remediation activities commenced in January 2006 and continued prior to, and during site redevelopment activities through June 2008 when a furniture store opened at the site. The Final Engineering Report was approved on June 17, 2008. The Certificate of Completion was signed on that date. Site Management, has commenced in accordance with the Department-approved Site Management Plan that consists of sub-slab depressurization systems and engineering and institutional controls.

Site Environmental Assessment
Site investigations showed that metals and PAH contamination is ubiquitous to all soils at the site. The sediment in the Erie basin is similarly contaminated. From the 1860s to the present, shipyards and related ship maintenance and repair operations have occupied the Site. Historically, shipyards have utilized a variety of hazardous materials, including petroleum products, solvents, polychlorinated biphenyls (PCBs), and heavy metals (used in marine paints) such as mercury, arsenic, lead, and copper. Large portions of the site were filled in at different points in the Site's history. The fill materials used at the Site are unknown, but may have included coal and incinerator ash, demolition debris, and industrial wastes.

During the site investigations, ninety-nine soil samples were collected from 80 locations, thirteen groundwater monitoring wells were constructed on-site and sampled twice, thirty-six sediment samples were collected from the Erie Basin, five composite samples were collected from three waste piles, twenty-three samples of sludge or soil were collected from drainage structures, sumps and manholes, two samples of stained wood flooring were collected, five samples of stained concrete flooring were collected, wipe samples were collected from the floors of the seven electrical substations, thirteen soil gas monitoring wells were installed to collect soil gas samples three wipe samples and one bulk dust sample were collected from ducts associated with a former dust collection system, and fifty-eight soil gas sampling points were constructed and sampled for organic vapors analyses and speciation.

PAHs and heavy metals were detected in most of the soil samples at concentrations well above TAGM values and regional background. Most of the PAHs and much of the metals contamination is heterogeneously present through the entire site and is largely attributed to the historic fill. Site activities were the cause the elevated concentrations of arsenic, copper, lead, and mercury found in some on-site locations that are well above the amounts typically found in urban fill. There were TCLP failures for lead at three locations that were excavated for off-site disposal. Some of the soil samples also exhibited elevated concentrations of VOCs and/or PCBs related to site activities. VOC and PCB impacted soil was remediated via excvation to TAGM 4046 cleanup objectives. Two rounds of groundwater sampling found that none of the PAHs, VOCs, nor PCB contamination found in the soil are significantly impacting groundwater. When the groundwater was sampled using a low-flow technique to minimize suspended solids during the second round, the metals concentrations were found to be below groundwater standards in all but three instances. Organic vapors, primarily methane, were detected in 35 of the soil gas sampling locations. Vapor barriers and sub-slab depressurization systems (SSDSs) were constructed in all locations (except support columns) that the large Ikea building contacts the ground. Three planned sattelite buildings will also have SSDSs. The sediment samples showed elevated concentrations of metals and PAHs similar to that found in upland soils. The site does not present a significant environmental threat.

Site Health Assessment
Since remediation is complete and the site is capped, contact with site-related contamination in soil is not expected. Exposure to site-related contaminants in drinking water is not expected since the area is supplied with public water. On-site soil vapor contains methane and volatile organic compounds. A sub-slab depressurization system was installed in the existing on-site building and will be installed in any future structures to prevent exposures from occurring via the vapor intrusion pathway. Marine sediments along the bulkhead were found to contain heavy metals, semi-volatile organic compounds, PCBs, and pesticides. However, since this area is not used for recreational purposes, exposure to site-related contamination in sediments is not expected.

Contaminants of Concern
Type of Contamination
Quantity
ARSENIC UNKNOWN
COPPER UNKNOWN
BENZ(A)ANTHRACENE UNKNOWN
PCB-AROCLOR 1260 UNKNOWN
PCB-AROCLOR 1254 UNKNOWN
BENZO(B)FLUORANTHENE UNKNOWN
BENZO(A)PYRENE UNKNOWN
BENZO[K]FLUORANTHENE UNKNOWN
DIBENZ[A,H]ANTHRACENE UNKNOWN
LEAD UNKNOWN
ACETONE UNKNOWN
NAPHTHALENE UNKNOWN
METHYLENE CHLORIDE UNKNOWN
MERCURY UNKNOWN


Contains a 70,000 square foot solar array system.

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